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SAASM Military Time & Frequency Systems
FEI-Zyfer offers
SAASM GPS military time and frequency systems with two SAASM receiver options. Both SAASM GB-GRAM and SAASM
MRU receivers are available for different military
applications. Each SAASM receiver is coupled with
FEI-Zyfer’s proven crystal (OCXO) or Rubidium
(Rb) oscillators to ensure stable holdover and output in the
event of SAASM signal or other external reference signal
loss. |
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CommSync II Product
Family Brochure (pdf) |
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Modular systems include
support for multiple input and output modules including
1PPS, IRIG, HAVE QUICK, PTTI, IEEE-1588 PTP v2, low
phase noise 1, 5, and 10MHz sine wave as well as custom outputs. Dual Redundant
modular systems (CommSync II & CommSync
II-D) may be configured with two SAASM GPS Time & Frequency (GTF)
modules and two power supply modules (AC and/or DC power)
for redundancy with uninterrupted automatic switchover.
Monitor and
Control functions are via an RS-232 communications port, a front panel
keypad and display, as well as optional Ethernet plug-in
modules providing Telnet, SNMP, PTP v2, and NTP.
Zyfer Monitor (FEI-Zyfer's remote access utility) provides
complete remote control, including system status, setup,
alarm logging and user management over a standard TCP/IP
connection. |
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CommSync II® Model 385
Dual Redundant SAASM GPS Time/Frequency System
CommSync II is 3U high,
fully-redundant modular time and frequency system combining
dual SAASM GB-GRAM or SAASM MRU GPS receivers, oscillators, and power supplies. There
are 13 rear panel option module slots available, 2 of which
can be used for I/O modules as well as output modules. |
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CommSync II®- D Model 407
Dual Redundant SAASM GPS Time/Frequency System
CommSync II-D is 2U high,
fully-redundant modular time and frequency system combining
dual SAASM GB-GRAM or SAASM MRU GPS receivers, oscillators, and power supplies. There
are 8 rear panel option module slots available, 2 of which
can be used for I/O modules as well as output modules. |
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GSync®
II Model 402
SAASM
GPS Time/Frequency System
The GSync II is a compact 2U high, single-string,
modular time and frequency system with a SAASM GB-GRAM or SAASM
MRU GPS receiver. There are 8 option module slots
available, 1 of which can be used for I/O modules as well as
output modules. |
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GSync® Model 391
SAASM
GPS Time/Frequency System
The GSync is a compact 1U high, single-string, modular
time and frequency system with a SAASM GB-GRAM or SAASM MRU GPS receiver. There are 4 option module slots
available, 1 of which can be used for I/O modules as well as
output modules. |
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AccuSync II
Model 405
SAASM
GPS Time/Frequency System
The AccuSync II is a compact 1U high, single-string,
SAASM GB-GRAM or SAASM MRU GPS
time and frequency system.
The design incorporates support for the most common output
requirements including 5 and 10MHz Low Phase Noise (LPN)
frequency references, multiple time references (NTP, IRIG,
Have Quick, TOD) and 1PPS reference output. User defined options
include
programmable DDS Frequency Synthesizer outputs, configurable IRIG output and multi-use 10/100 Ethernet ports.
Configurable as a PTP Grandmaster or Slave unit
utilizing IEEE-1588. |
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NanoSync
III
Compact SAASM
GPS Time/Frequency System
The NanoSync III is a very compact
(2.25 inch x 4.0 inch x 8.0 inch), low power SAASM GPS referenced time
and frequency module providing a precise 1PPS and
10MHz reference in a small, ruggedized enclosure. Available
with a SAASM GB-GRAM or SAASM MRU GPS receiver. |
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SAASM – Military GPS Receiver
The Chairman of the Joint Chiefs of Staff (CJCS) issued
a mandate to begin SAASM GPS receiver deployment as of
October 2002 and with full enforcement as of October 2006.
What is SAASM?
SAASM (Selective Availability Anti-Spoof Module) is the new
generation military GPS receiver technology, providing a new
security architecture and crypto key management
infrastructure. Receiver hardware and software assets are
protected by a tamper-resistant security module on the GPS
receiver board. Crypto key security is protected by a new
unclassified Black-Key infrastructure. Having unclassified
hardware and key logistics greatly reduces the complexities
of deploying military GPS.
What is Direct P(Y)
acquisition?
The pre-SAASM GPS receiver technology requires the Civil
C/A-Code signal to facilitate the acquisition of the crypto
P(Y)-Code signal. In addition to a properly keyed receiver,
the C/A signal provides the receiver with precision time and
other parameters needed to acquire the P(Y) signal. The Hot
Start acquisition functionality bypasses this need, able to
come on-line in the absence of the Civil, in-the-clear C/A
signal. This is a vital function of the SAASM receiver
technology, because in today's tactical warfare scenarios,
the C/A signal may not be available in the local area of
conflict.
Why use GPS SAASM in time/frequency product applications?
Many existing communications and data networks used by the
government and DoD receive precision time and frequency from
GPS-C/A-aided synchronization products. GPS-C/A
signals/receivers can be easily jammed or degraded, causing
degradation or loss of synchronization and communications,
unacceptable in vital applications. The use of GPS-SAASM
receivers prevents such loss of synchronization. Although
GPS-SAASM receivers are “controlled items,” they are not
classified. Only U.S. Government and its NATO partners are
authorized to use such military receivers. |
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Available Option Modules for
CommSync II® and GSync®
Products
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GPS
Time and Frequency Systems
